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Dynamic rocking response of “SDOF-embedded foundation” systems using shake table experiments
Abstract Nonlinearity potential of soil-foundation interface has such unknown aspects inspired by dynamic inherence of earthquake for embedded foundations. Accordingly, in this paper, a set of shake table tests in 1 g condition for three reduced-scale rocking “SDOF-foundation” systems with different foundation embedment depths was carried out through applying harmonic waves with three successive increasing levels of acceleration amplitude. Test results showed, for all specimens, rocking isolation caused reduction of transferred acceleration to the superstructure during moderate and strong excitation levels. Moreover, based on results, difference between superstructure maximum acceleration (in dynamic tests) and calculated theoretical value was limited for embedded foundations in lieu of static results. Also, the influence of successive excitations on residual rocking stiffness, fundamental period and damping ratio at time instant were explored. Finally, from a comparative point of view, it was concluded that the maximum moment experienced in dynamic test was lower than one of static experiment.
Highlights Rocking embedded foundations decrease transferred acceleration to the superstructure. Theoretical expression of foundation moment capacity estimates the superstructure acceleration response properly. The last cycle rocking stiffness tends to an approximately similar value for different specimens. For foundation rotational behavior, the dynamic moment-rotation cycles locate under static backbone response.
Dynamic rocking response of “SDOF-embedded foundation” systems using shake table experiments
Abstract Nonlinearity potential of soil-foundation interface has such unknown aspects inspired by dynamic inherence of earthquake for embedded foundations. Accordingly, in this paper, a set of shake table tests in 1 g condition for three reduced-scale rocking “SDOF-foundation” systems with different foundation embedment depths was carried out through applying harmonic waves with three successive increasing levels of acceleration amplitude. Test results showed, for all specimens, rocking isolation caused reduction of transferred acceleration to the superstructure during moderate and strong excitation levels. Moreover, based on results, difference between superstructure maximum acceleration (in dynamic tests) and calculated theoretical value was limited for embedded foundations in lieu of static results. Also, the influence of successive excitations on residual rocking stiffness, fundamental period and damping ratio at time instant were explored. Finally, from a comparative point of view, it was concluded that the maximum moment experienced in dynamic test was lower than one of static experiment.
Highlights Rocking embedded foundations decrease transferred acceleration to the superstructure. Theoretical expression of foundation moment capacity estimates the superstructure acceleration response properly. The last cycle rocking stiffness tends to an approximately similar value for different specimens. For foundation rotational behavior, the dynamic moment-rotation cycles locate under static backbone response.
Dynamic rocking response of “SDOF-embedded foundation” systems using shake table experiments
Arabpanahan, Mohammad (author) / Mirghaderi, Seyed Rasoul (author) / Hosseini, Abdollah (author) / Ghalandarzadeh, Abbas (author)
2020-09-20
Article (Journal)
Electronic Resource
English
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